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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fadbc231bba1fdd5ad949802199caf6684bc4d26497d9e32b786d558903f7b4' 
  AND token = 'SSRH7A3ZeU1d+xwT9CEItbCefLy44ob5wob0AKFzd0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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