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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213fea6a75bd694461d7ad5909a3697e398309b6e341a46aaa99df60e0835b05' 
  AND token = 'MhzNAxnaZ3Ad6X7Hxke4sVhk2tZIwq2ZkQ/vy8/h9dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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