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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2238f461d7ee6d33aae54fc0faa4046b8428c39ca4a9339e79e0b8f56f61185' 
  AND token = 'TYS55tloNtmGR/YbZzU1Kop+pAq59UMU6BtiLvyU5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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