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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9a1616113513b45ea7fd7f61ace9b90b0fde7930c2715f30248a26afe57bb1' 
  AND token = 'J7ax9FJcgbNpIbNmkSh9b0NPN4pyNjg1ZRqYK8xt6sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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