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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9fb2ed108baac86bf8a643106ac7919ec4d5b1fa723636edb62996bb810556' 
  AND token = '+1LnHQJ4tWWLpmPwN19fM0j3nbPUmhIdbTdoCV6Q1FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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