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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32968be8dc0c819f159d6c43d1f08e38d9428b51f65dff6817df50de661bfe26' 
  AND token = '4+Rt6mWlwftaYrsBLYdM8J3X4bauTMPpnpYRChRwqlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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