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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8a88468954ed42954ee04575a32ec7304d7fcbb7e06beff8e46f31f4eaea8f' 
  AND token = 'K6/wfao7Ek/HwonpG4H+rgP8KQsyP9TzYXCGRoHO52M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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