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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd371f9b375730499001141607899c0629a0858ac5110438412cf5cd67053cd57' 
  AND token = '1xLvtRt+vQsXlkIvgm1qy8IO142lDoQmTJjXjy67dZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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