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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0245b27753aae74fa3f1de4fefc619f71c83a09535c3d1234d8048e9b0729d8f' 
  AND token = 'Yr6Oc8XgBGWdSUc8szfpP70ZK+QrlG5lRACLFszz7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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