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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943b497f145057f75f4a784a9c6980d9ab9ace52ef417ffa18eead591ca494e6' 
  AND token = '5s6/qbhuME5wv1mtaZODZJsC1N4DNcJbbc1IDOCEI9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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