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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ed862acca9b2987f62b282c35672b8e9904f4e82cf1d38f5974c121cf15617' 
  AND token = 'FkJD0vmJed7k8LWf7RJnLsSInL9/eTOe7zhGDf/nEnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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