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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b691f41d9842434650a4a635c202e9211a99203906ca0fa54dc0103c0553cf8' 
  AND token = 'S3Y+bMel8CbnTdcd2hfJGc1T8d2f2pGGBZbyXp2m128=' 
  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"
    }
  }
}