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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94af760132ad5a29fc27e77a06ac3c19a8a84df4a3ea79ee3bb71f63b10bfe5f' 
  AND token = '/naAah7h85L0EbxPl9MozNSsHdmXGcAbMF1uIckDc8w=' 
  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"
    }
  }
}