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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbccb8e6909b36f9e4b23f65155e8a0935c9a3acb4ab0a182cdd083c563fadc' 
  AND token = 'WjhYA0l6Ky9WbcqQMB+BPc2CQw9tu4RjioOiPfB13/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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