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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4029ef2e34277d87f10ea04e0948a3bee4f5515301c1690ce945aac37fb90c9' 
  AND token = '5y0vyvhdt+RwxpcgplvC15r5JeJQfDMF5anaTP1ceg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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