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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de317806de9b3d98525c81e62dffd919390f095773a577cfc3f029e76be3eb7' 
  AND token = 'US9y760Cv3ktpMnP3tKzQ57ey3MXT4U2KpQOSOKSF+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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