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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7bdbe6f67c99160a06bda19c34ecdb07572d17b6ea5612f31a2c31428fd0e9' 
  AND token = 'SELd4L+hrYX9jXXv00eUXZDwm4UFCk0JrJKDpog53n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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