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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd173d6487ebd22fd354bfb0c84ec52d93ced2007eda2d2c293f11b7ad44b3f1f' 
  AND token = 'SgZ7/eFyPB9dylAHy6IfAq9uhcIJ/ILlQQC/mRMMD+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}