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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d16bc464e519bc40e4e5282b3447333b16553288f8e3a5cdaef830f846e9a33' 
  AND token = '7/3IE+Z8w9OMpKtMQdKtScEPJ/0xe6JRxs0Mexp/URQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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