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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b605d07a70a7c82ce1166b9a9ba02da5793975f2ab4350e7bd6c2c93ee4ebc6' 
  AND token = 'myoU6VmUMI0ZPRpGWnSTVCG/9+tEbH23B4x0UtMxc6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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