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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4f7783fffafcb6008662de374fb5bc4526882224a19a6ff7f8e0af69c1592e' 
  AND token = 'usG/fANlJ0/ftgZVzH4tNTiLebqltjI3bG/eMD5UY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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