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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9288074eb3cc22c70f75f84b2f1456e0b24db56d3ae7218bde61f1799bece82b' 
  AND token = '9RaBrzanEcfVHmPICIX1VX8eqhEKFGhrGbj2q0YV7+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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