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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d6b319069f4b0fce461c1214438d2e1d79184076f81e6ecfd3fe0deb05aed0' 
  AND token = 'PfUcMDO8U3jRDXoPz5eWfDr7QQ9+FWztpVYld2Pi0NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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