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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f214fb343d686e60c58c3d0a33a963067d6d61f343603640c7a468947efa976' 
  AND token = '4SnOTCih8zgr9OqZH0Nr4fh0/C2fmUmmHygDJ+653a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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