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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560d7f8e41a4d3f87b43c831da663eee07a9cec13c276dbc9fbb66f468f8a36c' 
  AND token = 'M6cPUntJAggkvyEJjF0P+iP45hw52rONg3xMZNAoOjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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