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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190919b8aff3a8513cf2ef6f71132e34e97ce0d0a5df89703cd10e9992fe1cc1' 
  AND token = '5lwcqaXBLA1lNZo3WLBSj4yZGnvVqqmjBxO/zWWecbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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