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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2ddb8ad7121518bfb8501942aff018d56d6a8546c8fcb51eb64cef311e17a5' 
  AND token = 'vHZS7pyN8oKPzb20+qxMeIOJPBaVDD39XbujON1y23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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