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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07608fe79cbafad57b748006a9173976c3a95de9412910c11f23709b8f147dfc' 
  AND token = 'j9k2jxDcT0e/yYdhvXHINwzCLhDZlH1+Xj4HcTl8zxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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