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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7024b9de28eabf962b3406af97ed2d857b31d2b084efe2aebae9ca649c0637e7' 
  AND token = 'yoBMSDWY3v8ZI+H9M32y/SoXebrFbaluTBTgoqLX9P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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