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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af373a20e229f29ce158cd5ab2ffd7876cdb5f217a81bc53b78d84d29c10696c' 
  AND token = 'Qh11XwzCmR9RZAsHQLUJJfVRXKSb0I+S5txP07mkeJ8=' 
  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"
    }
  }
}