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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b02e71f8c890b34161475d9326aa9680ac6430f039e211c0fb3017eaefab27d' 
  AND token = 'c413qvjodOnMMf4Q0M6PmQG7dnRK4U9m225k+yn0F6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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