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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63253d93445b5ad6686f257bc9ddae168624b4fcbffb86bb3882090eeae6164' 
  AND token = 'foaf4Z84X8PbGlyfu3On5f9OiXWES90wL0i+5hjka4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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