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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddacb9b62cb646fa99fe8fcc28d66c20e079da1d9b68b0954915ca09a09c9c7' 
  AND token = 'YdBRO0N/e4BXtuttkz97XQ+N9+f5dq7ZaFhPf6yPOt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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