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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f9aa6a3d34b9b9fc007f363ea7d48934128ff4b9cefb534f1cf93f674e5403' 
  AND token = 'u4mXp9vXLwjLwZpNZNMaZE5UYS6Z033C4D44YhbbvBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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