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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619bfb4a57d4829a3adc98fdfd1991e77036a53d222cae1dba2a75e627a32c42' 
  AND token = 'XWuALMl00s2DQKsthdKty9QebQLXlU3HfaCrc+P+ss8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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