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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa6a2914f80984f6177f26ec7391e104d998e1b579b8997f844ea0e89107ec2' 
  AND token = 'OUQFw2Iv7rojhevyBdhy5jq4G8qKXZ1m18YbJ1Dml0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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