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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a4d547205a49406bf4caaa5c896123b1a77e3c426fa1f8433eaf00485cf6fa' 
  AND token = '4sIyJ/80gXiPx+lMVKOCJjfT//tOsdQVU0E1If4vlZI=' 
  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"
    }
  }
}