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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ba3e56436c5e9c3093f4e317d31e62459673c46c3cb3839843624b6dc8c985' 
  AND token = 'zxvJJT+c9G7Cq55RlbNzfFvr0r77zpeFa9ZB46bPziI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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