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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cf471f41f2b2d75214d72eede2aaea55d3c5d3f0504398e36a78e3d7057420' 
  AND token = 'aim0ZaZy5z33zHpbRmEt2n02h321ofKtK9JwXqGfQms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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