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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5bd80c40865ba36e942cb6dcb3401a668c80b46967f6e1515a290c58d47e22' 
  AND token = 'xucvQ0T673eQuEYgM7hbvkJrC6etILuA++hJeMDsItY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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