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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc8e5858d9efb1b1daad22bd6ed09cd9ec9377cc3de53ad470870fca9e5041c' 
  AND token = '0jWCyYPY+Hx5XyFWKIC5k9McLzz6CvU/Vwv9zFZ1QYw=' 
  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"
    }
  }
}