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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5482488f71a0af45a30c5f1ef7cfac7ad9c5f1b0f68936c36df5119e972b8df1' 
  AND token = 'Xj9f9jeNoboaVrLI7+5zQXN9zsRBzDBJFvp++aSzs9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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