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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42cee5243be2800c304c2bab85c32675bd4a18bd3c05164844d4877855ca1995' 
  AND token = 'kjK2etVpGKy1/7gfWFp27fZj+dpENz/11WVKc/As81c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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