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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a54938e39b2025cfa548ad89de44b34f6eaa3963b61612651a3939afca01c3e' 
  AND token = 'bYns6pIhUHkYRnKI2Dubod+y/Ad0CujTG5aIZh4+EKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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