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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550a0c9b4eb86822b71c2a23a548b8599fdf23f92f72c929b3ec86bfb8829d85' 
  AND token = 'KtY60YSy/h6pCHIi91P4aS648iv3+a6W6L/FMYI3ILE=' 
  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"
    }
  }
}