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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3706fffbf48fdc574a8b519bcd5e2e1e0c5856f94f8a345ab9c24faea5e4948e' 
  AND token = '67L2/OXT0wy7C/iNhCEW1j8rsa7w7ItZq2OleCjp7DE=' 
  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"
    }
  }
}