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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1570c1019a292790d847bd805417b8f6db69d911e98176b4023518bcf81fde39' 
  AND token = 'xNNy6JFh1s+8UUsP7DkvQZcskpGXa5S1TBPn5PlTs4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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