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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1b3fd8841bf76e38fa875ed9b944c22f2ff1f234030a949b5f9da0aef74c16' 
  AND token = 'Q5PvZxAW/yNN0aAsIrRMOwF+P+jZ9qf0EAUx05QS3k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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