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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56ac66bf8c5ae815ae0a1762e4bb18f9b3ad36327ac444ecef15149b2bc3db1' 
  AND token = 'PEg0+bAjUPuRTPrg4QVJsvF5ivuv+mrktc6WmVOUwlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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