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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c405d99dd4ff534765201460339c1169e265c0756046f44d3370a8443c79f82' 
  AND token = 'sf08lOWa5svALqqBh7Emd3Z/+6pvtdw0vDebxuYyNSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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