Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2700e09645854cb5d47aebdfabababbea3853e3f5ed72fef7f7642ddfcda48f2' 
  AND token = '8kFAzjjRaZmWJcg07zL+aL3LsxTbjQkMlolSNsrM3tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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