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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bf794f2cbb095542fef09a98cceccb780167d58a1b2a27d6e2b7439d639f41' 
  AND token = 'LL8GbsnDZIJHQwPR04y5VidXnUN/IAQaRrjmloMlM+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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