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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9a4148bd22474568dc0801bc097e2101e7b6a037f3bebf30efb7f619e22acc' 
  AND token = 'MEn9+HdybK3AJqlerMjo8A/5bQGVt8i3zWgCsW6GNts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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