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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40104dc73c9c5415b39d1b3bb25c9a02ba1558aec82e8eef9f4f880f5ddf560' 
  AND token = '41N9i/b+sCF+Yna26ALxsHPMAOVEAZp81xfMEvAqg4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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