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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f88ea50a87209c9d03ea5ce35500035e2a0448b0ad1c48b9d4949dc10cb8493' 
  AND token = 'jUYbkUhZp9oo0JdGdA7rmUp2sCS90ypIjgStR/ZCjFs=' 
  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"
    }
  }
}