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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a3a12e83ab17c112033628e7818636edaa87c4872f54f42e584c87ba29c4a9' 
  AND token = '72YBodFPViMPvIU+Vu6QSqVIETTtQv9XYVMJbkwQJrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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