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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a42b45d6045f401db513f57df501b4073955ef56c8d5dec5819531f5c5aa095' 
  AND token = 'b7Zjiyv2RaPFL2ihsa/BAlSgFMqgU275tukslqF+WlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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