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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c026cd2dea6aabb5255c7b555c537bbe96b7b70ae1a5ba24b8fc9f58b729a6' 
  AND token = 'oRmEilEIruhul2RfA+bJ5VCHWLeNWAdbmOjAkXuePS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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