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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e787eff1cef3568df2891111a5323ba0b51104adf279f675eae97948bbcdf4b1' 
  AND token = 'AQI1r3QwhVSIjR8RYdLvBNldJdApY67gqBV7A8cCeu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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