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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0cdb01be301deb7dd5427abf5f7012dc6f9afc2d7197a9960c3c7b4f0a93ac' 
  AND token = 'oohDf03Jl0q174H6tiBCrCrFj9T211d0mukWUMKmpbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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