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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ce630b682c9627379e16e4678e74f5cf98f20ef4f68633c5097ba98d69d770' 
  AND token = '9F0O1qUbHQ6YEXj59ltNxbIr3+yiuBas/LEF/A2xNGQ=' 
  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"
    }
  }
}